Safety
ZenCortex Side Effects: What to Know Before You Start
ZenCortex side effects come from its ingredients, as the bottle lists none.
These include caffeine from guarana and green tea, possible bleeding effects, and blood sugar or blood pressure effects. The label says to ask a physician first, especially if you take a medication.
To check if it suits you, see who it is for.
Written by the ZenCortex label deskUpdated
The short answer01
What are the side effects of ZenCortex?
The side effects of ZenCortex are not known as a product, because no safety trial exists. The reported effects belong to its ingredients, mainly caffeine effects, stomach upset, sleep trouble and interactions with medicines.
The label gives a caution, not a side-effect list: do not exceed the recommended dose, not for anyone under 18 or pregnant or nursing, and consult a physician before use. Each blend line has an amount hidden in a 200 mg total, so we cannot say how large any one effect would be. Label order sets only ceilings (eCFR, 21 CFR 101.36 Supplement Facts).
The NCCIH advice for any supplement applies: tell your providers, follow the label, and stop and call a provider if side effects occur (NCCIH, Using Dietary Supplements Wisely).
Line by line02
Which ZenCortex ingredients cause side effects?
Guarana, green tea extract, grape seed extract, chromium and the licorice-derived line have the most documented cautions among the ZenCortex ingredients.
The table gives the reported effect per line from the cited pages. A report is not proof that this product causes it, since the doses in the blend are unknown.
| Ingredient | Reported effect | Ask first if you take |
|---|---|---|
| Guarana | Nausea, insomnia; heartbeat changes at high amounts (MSK, Guarana) | Stimulants, blood thinners |
| Green tea extract | Rare liver injury; caffeine (NCCIH, Green Tea) | Atorvastatin, nadolol |
| Grape seed extract | Antiplatelet activity in lab work (MSK, Grape Seed Extract) | Warfarin |
| Chromium | May add to diabetes medicine (NIH ODS, Chromium fact sheet) | Insulin, metformin, levothyroxine |
| Glycyrrhizinate | Irregular heartbeat at large amounts (NCCIH, Licorice Root) | Blood pressure, heart, kidney conditions |
| Tryptophan | Serotonin syndrome with some drugs (Cleveland Clinic, Serotonin Syndrome) | Antidepressants |
Caffeine03
Does ZenCortex have caffeine?
Yes, ZenCortex has caffeine sources: guarana seed extract and green tea extract are both on the label. The amount is not printed.
The seller's info page says "No Stimulants". The seeds of guarana contain caffeine, and many of its effects are credited to it (MSK, Guarana). FDA cites 400 mg a day as an amount most adults tolerate, and says too much can cause a racing heart, palpitations, anxiety, insomnia and jitters (FDA, How Much Caffeine Is Too Much?).
Count the coffee, tea and energy drinks you already have, and take the drops earlier in the day.
Bleeding and blood sugar04
Can ZenCortex affect bleeding, blood sugar or blood pressure?
It may. Grape seed extract, astragalus and guarana carry bleeding notes, chromium and gymnema relate to blood sugar, and arginine, forskolin and astragalus may add to blood pressure drugs.
Astragalus may raise bleeding risk with warfarin and add to blood pressure drugs (MSK, Astragalus). Arginine may add to blood-pressure-lowering drugs (MSK, Arginine). Forskolin has reported low blood pressure and possible additive effects with blood thinners (MSK, Forskolin).
Tell every provider about every supplement before surgery or a procedure.
Check your medicine05
Which medicines matter with ZenCortex?
The medicines that matter most with ZenCortex are blood thinners, diabetes, thyroid and blood pressure medicines, antidepressants, stimulants and anything cleared by the liver.
Many herb and drug interactions are based on lab or animal work, and a professional should weigh your case (NCCIH, Herb-Drug Interactions). Pick a medicine type below to see which ingredient matters. Your pharmacist can check the actual drug.
Blood thinners (warfarin, aspirin)
- Grape seed extractAntiplatelet activity in lab work; may raise bleeding risk with anticoagulants (clinical relevance not determined). (MSK, Grape Seed Extract)
- GuaranaAntiplatelet activity that may raise bleeding risk with warfarin. (MSK, Guarana)
- AstragalusMay raise bleeding risk with warfarin. (MSK, Astragalus)
- Asian ginsengMay interfere with clotting; people on blood thinners should talk to a provider. (NCCIH, Asian Ginseng)
Blood-pressure pills and water pills
- AstragalusMay add to blood-pressure drugs and increase diuretic effects. (MSK, Astragalus)
- ForskolinLow blood pressure is a reported effect; possible additive effects with blood-pressure drugs. (MSK, Forskolin)
- L-arginineMay add to blood-pressure-lowering drugs. (MSK, Arginine)
- Glycyrrhizinate (licorice)Glycyrrhizin can cause serious effects such as irregular heartbeat; people with high blood pressure, heart or kidney conditions may be affected by small amounts. (NCCIH, Licorice Root)
Diabetes medicines
- ChromiumMay add to insulin and metformin in lowering blood sugar. (NIH ODS, Chromium fact sheet)
- African mangoRat studies suggest additive blood-sugar lowering with antidiabetic drugs. (MSK, African Mango)
- Asian ginsengMay lower blood sugar. (NCCIH, Asian Ginseng)
Thyroid medicine (levothyroxine)
- Chromium picolinateA small study found it reduced levothyroxine absorption when taken together. (NIH ODS, Chromium fact sheet)
Stimulants, caffeine and heart rhythm
- GuaranaA source of caffeine; caution combining with stimulants. High amounts can cause heartbeat changes and high blood pressure. (MSK, Guarana)
- Green tea extractContains caffeine. (NCCIH, Green Tea)
- All caffeine sourcesAbout 400 mg a day is the amount FDA cites as not generally associated with negative effects for most adults; sensitivity varies. (FDA, How Much Caffeine Is Too Much?)
Immune-suppressing medicines and digoxin
- AstragalusMay reduce immunosuppressants; one patient's tacrolimus fell nearly 50% with a multi-herb formula. (MSK, Astragalus)
- Bird pepper (capsicum)Avoid with cyclosporine. (MSK, Cayenne (Capsicum))
- EleutheroA case report found raised digoxin levels and it may falsely elevate digoxin tests. (MSK, Siberian Ginseng (Eleuthero))
Statins and other medicines cleared by the liver
- Green tea extractExtract can lower atorvastatin levels; high doses can lower nadolol levels; rare liver injury is reported with extract capsules. (NCCIH, Green Tea)
- Grapefruit-related linesGrapefruit juice changes how some medicines are cleared; the FDA page covers juice and fruit, not grapefruit seed extract, so ask your pharmacist. (FDA, Grapefruit Juice and Some Drugs)
Surgery or a dental procedure
- Everything on the labelTell every provider about every supplement before surgery; some raise bleeding risk or affect anesthesia. (NCCIH, Using Dietary Supplements Wisely)
A starting list for a talk with your pharmacist, not a full interaction check. Keep taking prescribed medicine; never stop or change a dose because of a supplement.
ZenCortex: from $49 a bottle60 mL drops · 2, 3 or 6 bottles · free US shipping on 3 and 6 · 60-day guarantee
See packsIf you react06
What should you do if ZenCortex gives you side effects?
If ZenCortex gives you side effects, stop the drops and call a healthcare provider, as NCCIH advises for any supplement (NCCIH, Using Dietary Supplements Wisely).
Chest pain, a racing or irregular heartbeat, fainting, trouble breathing, swelling of the face, severe vomiting, yellow skin or eyes, or unusual bleeding. Sudden hearing loss in one ear is also an emergency (NIDCD, Sudden Deafness).
Report a problem to FDA through MedWatch (FDA, MedWatch). Keep the bottle and note the lot number, ZEN-26/TH-7233 if it matches yours, a seller reference and not lab proof. Call the order desk at +1 (380) 868-3839 about returns.
Keep on track08
Should you stop your medicine because of ZenCortex?
No. Keep taking prescribed medicine exactly as directed, and never change a dose because of a supplement.
Bring the bottle to your pharmacist. Then read who ZenCortex is for and ZenCortex ingredients.
FAQ09
ZenCortex questions people ask
Does ZenCortex cause jitters or trouble sleeping?
It might. Guarana and green tea extract carry caffeine, and FDA lists jitters and insomnia among the effects of too much (FDA, How Much Caffeine Is Too Much?). The label prints no caffeine amount. Take the drops earlier in the day and cut other caffeine.
Can ZenCortex upset your stomach?
It can in some people. Nausea, stomach irritation and bloating are reported for capsicum, arginine, guarana and amino acids at high amounts. Mixing the drops into water or juice may help, and a pharmacist can advise.
Is ZenCortex bad for your liver?
No liver harm is shown for ZenCortex. Rare liver injury is reported for green tea extract, mainly in tablets or capsules, and case reports exist for glutamine at high doses. Yellow skin or eyes need care at once.
Does ZenCortex raise blood pressure?
Possibly, in some people. Caffeine can raise blood pressure, and large amounts of glycyrrhizin from licorice matter for people with hypertension (NCCIH, Licorice Root). If you have high blood pressure, ask your doctor first.
Can ZenCortex interact with antidepressants?
Possibly. Tryptophan and ginseng are named among causes of serotonin syndrome with serotonin-affecting medicines (Cleveland Clinic, Serotonin Syndrome). Ask your doctor or pharmacist before combining, and do not stop an antidepressant on your own.
Are there allergy risks with ZenCortex?
The label names no allergens, and the badges say gluten free and dairy free, which are seller claims. Plant extracts can still trigger reactions. Stop and get care for hives, swelling or trouble breathing.
How do you report a bad reaction to ZenCortex?
Report it to FDA through MedWatch, and tell your provider (FDA, MedWatch). You can also tell the seller's order desk at +1 (380) 868-3839. This website's inbox cannot see orders but can note a typo or concern.
Who wrote this10
Written and reviewed by
Pages built from the label, the sales page and linked NIH, FDA, CDC, FTC and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is run by Thezencortex, a retailer of ZenCortex, not by the manufacturer. We earn money when you buy through our order links.
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